I'm playing with two browsers: Firefox 57.0.2 and IE 11.0.9600.18816 + 11.0.47.

When editing the Confluence page and copying the said text then SOMETIMES I get a correct paste: both colors and newlines. Most of the times though everything is pasted onto a single line (colors okay).

Whenever I have the chance to get a "correct" paste then I can close the editor and edit again, the pasted text still shows okay. However, as soon as I SAVE the text then the newlines are removed. That behavior is browser independent.

If I edit the same page in both editors, whenever I SAVE the page in one of the browsers then Synchrony immediately "adjusts" the text in the other browser by removing the newlines and flattening out the text over a single line.

A not-so-ideal workaround for now is to use OneNote as a copy/paste hub. Copying to OneNote first, then copying the OneNote text and pasting to Confluence seems to hold the newlines when saving the page. The first paste after opening the page for editing is always in b/w. I have to undo and repeat the paste, even multiple times (once or twice in IE, but often up to ten times in FF) to get a good colored paste! God only knows what's happening inside Confluence in the meantime.

Looks as if there is something not so stable in the Confluence editor newline and color processing...